I use NGK BP7HS. My recollection is that the BP8HS is hotter and the
BP6HS is colder.
Tony
At 10:45 AM 10/22/2012, Scott Janzen wrote:
>I am prepping the recently acquired TR4 for the Turkey Bowl at
>Summit Point (Thanksgiving weekend) and thought I would get some new
>plugs. The current plugs are NGK BP8HS-10. These come up in google
>searches as being used for marine applications, though there's
>nothing in the part number that indicates that use.
>Engine is about 170 psi compression, 12:1, guessing from the cam
>that the engine will be running between 4,000 and 7,000 RPM. Plugs
>are running light-medium brown, so apparently about the right heat range.
>Recommendations for plugs, or should I stick with what I've got?
>
>Here's the current spec:
>non-resistor plug
>Thread Size: 14mm
>Thread Reach: 12.7mm (1/2")
>Hex Size: 13/16"
>Heat Range: 8
>Gap: 1.02mm (.040")
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